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This is not a duplicate of Autocomment when voting to close as duplicate as that simply indicates that the feature exists. This is a "how" question asking how this feature actually works, which that answer does not address.

I just voted this question as a dupe, with 3 other votes existing before mine. I then noticed that I automatically upvoted the top comment, despite it not starting with Possible duplicate of.

What's the exact criteria for finding the "duplicate comment" for automatic upvoting when I cast an extra dupe vote?

Related: Subsequent duplicate close votes should automatically upvote the possible duplicate comment

Also related: When a question is closed as dupe, all comment starting with Possible duplicate of deletes.

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    As a test, try voting to close this question as a duplicate of the proposed target. Does this comment get upvoted? – Sonic the Bracketed Hedgehog May 5 at 5:08
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    Possible duplicate of Autocomment when voting to close as duplicate - Jeff's answer says yes. – Rob May 5 at 5:18
  • @Rob Not a duplicate. That question is simply the feature request and announcement of this general feature; this question is asking about that feature and the answer to how the system detects this special type of comment is not addressed in that question. This is not a simple yes-or-no question asking if comments get upvoted; this is asking how the system knows which comment to upvote. – Sonic the Bracketed Hedgehog May 5 at 5:20
  • @SonictheInclusiveHedgehog wow, really upvoted – iBug May 5 at 5:20
  • @SonictheInclusiveHedgehog The word "how" only appears on this page in your comment. You can see that you edited your 'notification comment' (as I did mine) so it seems likely that it links the comment #. An answer from a Dev will probably wait until next week. – Rob May 5 at 5:25
  • @Rob My question asks What's the exact criteria, which IMO isn't quite different from How. – iBug May 5 at 5:26
  • @Rob "How"-type questions need not necessarily use the word "how". Additionally, Jeff isn't saying it's implemented; just that it's a good idea (the actual feature wasn't implemented until 2015). – Sonic the Bracketed Hedgehog May 5 at 5:27
  • Between being status-completed and the discussion in the comments back and forth between the Devs I'd say they've done everything but 'give ya da codz', you're know for skimming because you're busy and have said exactly that previously; yet there's always time for multiple replies and answers. What I flagged VTCD is the oldest, the other post is newer and just regular users guessing. – Rob May 5 at 5:47
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    @Rob As can be seen from the status tag edits on that question, that user was a Stack Exchange employee at the time, not just a regular user guessing. – Sonic the Bracketed Hedgehog May 5 at 6:03
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    Based on the OP's title alone. "What will be printed?" and "How will it be printed" are not asking for the same thing, the first is about content/text, the second question is about the mechanism behind printing. Likewise "What (which would be a better word here) precise comment will be upvoted" is not asking how the site's system recognises the dupe signalization comment. – Mari-Lou A May 5 at 6:16
  • @Mari-LouA "What's the exact criteria for finding it" is indeed asking how the system recognizes it. – Sonic the Bracketed Hedgehog May 5 at 6:20
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    So I would suggest that the OP modify the title to better reflect its meaning and intention. I specifically started my comment by saying "based on the title alone" – Mari-Lou A May 5 at 6:21
  • @Mari-LouA The 6th W is for weason. – Rob May 5 at 9:56
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There is an internal flag that is saved along with the comment that is automatically posted when someone votes to close as a duplicate, for a target that hasn't been selected before. When someone else votes for that same target, it makes an upvote for the comment with the internal flag indicating that it's corresponding to that specific target.

Due to the modified duplicate closing policy on this site, I often edit my "possible duplicate" comments so as to point out how it's a duplicate. As of January 2019, duplicate comments are no longer automatically deleted upon closure if they were edited.

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